Motor fuel



Patented May 6, 1930.

UNITED STATES cam. -o. JOHNS,

OF ELIZABETH, NEW JERSEY, ASSIGNOR TO STANDARD OIL DEVELOP- KENT COMPANY, A CORPORATION OF DELAWARE MOTOR FUEL No Drawing.

This invention relates to motor fuels, and particularly motor fuels whiahjt is desired shall be operable under relatively high engine-compressions without knocking or detonation.

I As is well known, certain petroleum hydrocarbons are sensitive to high engine-compressions, and motor fuels containing such constituent-s are prone to knock or detonate when 19 used in engines haying compressions exceeding a relatively low ratio. To meet this condition it has been proposed to add to such fuels a metallo-alkyl compound, particularly lead tetraethyl. While effective in reducing the knocking propensities of the fuel, objection is made in some instances to the presence of as much lead as is involved in the amount of agent required.

In accordance with the present invention the amount of lead or other metallo-alkyl compound necessary to accomplish the desired object can be minimized, it being found that in adding lead tetraethyl to gasoline for instance, the knocking propensity of the gasoline is reduced not in direct proportion with increasing increments of added lead tetraethyl but the first cubic centimeter of lead compound for instance per gallon of gasoline ditionalincrements of the anti-knock agent is successively less. In preparing a motor fuel. I employ a small amount of lead tetra ethyl, suflicient in quantity to produce the first and greatest effect but instead of adding further increments of lead tetraethyl to equal the total proportion of the agent heretofore customarily used, I further modify is the most effective while the result of ad Application filed Kay 21, 1924. Serial No. 714,809.

added to the mixture. Examples of compositions contemplated are-.

I. A mixture of about of gasoline, 20% of benzol, and 1 cc. of lead tetraethyl per gallon of the mixture.

II. A mixture of about of gasoline, 5% of benzol, and 1% cc. of lead tetraethyl per gallon of the mixture.

It is also possible, and often desirable to use mixtures containing more than one organic modifier as is shown by the following example:

III. A mixture of about 85% of gasoline, 5% of alcohol, 10% of benzol and 1 cc. of lead tetraethyl per gallon of the mixture.

I claim:

1. A motor fuel which comprises a mixture of about 80% of gasoline and 20% of benzol, and lead tetraethyl in the amount of about l cc. per gallon of the mixture.-

2. A motor fuel which comprises a mixture of 70-95% of gasoline -and 5-30% of benzol, andlead tetraethyl in the amount of 1-2 cc. per gallon of the mixture.

. 3. A motor fuel which comprises a mixture of gasoline with not to exceed 30% of benzol,

and lead tetraethyl in amount not to exceed 2 cc. per gallon of the mixture.

4. A motor fuel which comprises a mixture of about 85% of gasoline, 5% of alco- I 1101, 10% of benzol and lead tetraethyl in an amount not to exceed 2 cc. per gallon of the mixture.

5. A motor fuel which comprises a mixture of petroleum hydrocarbons with a relatively small proportion ofbenzol, and tetraethyl lead in amount not to exceed 2 cc. per gallon of mixture.

6. A motor fuel which comprises petroleum hydrocarbons, a hydrocarbon of the type of benzol, and a metallo-alkyl anti-knock agent.

7. A motor fuel which comprises a mixture of petroleum hydrocarbons, a hydrocarbon of the type of benzol, alcohol, and a metallo-alkyl anti-knock agent.

CARL o. JOHNS. 

